Largely manufactured from recycled glass (e.g. windscreens) and mineral base materials such as sand and without the use of binding agents. The ingredients are melted into molten glass, which is cooled and crushed into a fine powder. The powdered glass is poured into molds and heated (below the melting point) in a "sintering" process that causes the particles to adhere to one another. Next, a small amount of finely ground carbon-black is added and the material is heated in a "cellulation" process. Here, the carbon reacts with oxygen, creating carbon dioxide, which creates the insulating bubbles in the (material). CO2 accounts for more than 99% of the gas in the cellular spaces.
Cellulose insulation is a material made from recycled newspaper. The paper is shredded and inorganic salts, such as boric acid, are added for resistance to fire, mould, insects and vermin. The insulation is installed either blown or damp-sprayed depending on application.
Wood fibre
The success of wood fibre insulation derives from an attractive environmental profile combined with a whole bag of functions including rigid insulation, sheathing and sarking for timber frames, roofs and flooring as well as flexible insulation for studs and rafters.
Wood of course is renewable, it sequesters carbon during its growth and product production is relatively free from pollution. The insulation value of wood fibre boards is not as dimensionally efficient as some of the orthodox petro-chemical materials - but it's no slouch either - typically coming in with a 'k value' range of between 0.038-0.043 W/mK depending on format.
Hemp
Hemp fibres are produced from hemp straw of the hemp plant. Most hemp is imported, but an increasing amount of home-grown crop is becoming available. Hemp grows up to a height of nearly 4 metres within a period of 100-120 days. Because the plants shade the soil, no chemical protection or toxic additives are required for hemp cultivation. The product is composed of, usually, 85% hemp fibre with the ballance made up of polyester binding and 3-5% soda added for fire proofing.
Straw
Straw is an agricultural by-product, the dry stalks of cereal plants, after the grain and chaff have been removed. Straw makes up about half of the yield of cereal crops such asbarley, oats, rice, rye and wheat.
50mm Knauf DriTherm 37 Standard Cavity Insulation Slab is a non-combustible, water-repellent glass mineral wool insulation slab with a certified thermal conductivity of 0.037W/mK for use in masonry full fill cavity wall applications.
Dritherm37 Knauf Cavity Slab 50mm is a highly durable, odourles..
65mm Knauf DriTherm 37 is a standard non-combustible, water-repellent glass mineral wool insulation slab with a certified thermal conductivity of 0.037W/mK for use in masonry full fill cavity wall applications.
Knauf Cavity Slabs are highly durable, odourless, rot proof, non-hygroscopic, does not..
75mm Knauf DriTherm 37 Standard Cavity Insulation Slab is a water-repellent glass mineral wool insulation slab with a thermal conductivity of 0.037W/mK, used in external full-fill masonry cavity walls.
Dritherm 37 Knauf Cavity Slab 75mm is a highly durable, odourless, rot proof, non-hygroscopic, ..
85mm Knauf DriTherm 37 Standard Cavity Insulation is a water-repellent glass mineral wool insulation slab with a certified thermal conductivity of 0.037W/mK for use in external masonry full fill cavity walls.
Knauf DriTherm 37 Cavity Wall Slab 85mm is a highly durable, odourless, rot proof, non-h..
100mm Knauf DriTherm 37 Standard Cavity Wall Slab is a glass mineral wool insulation slab with a certified thermal conductivity of 0.037W/mK, used in external masonry full-fill cavity walls.
Dritherm 37 Cavity Slab 100mm is a water-reppelent, highly durable, odourless, rot proof, non-hygroscopic,..
125mm DriTherm 37 Glass Mineral Wool Slab is a non-combustible, water-repellent cavity insulation slab with a certified thermal conductivity of 0.037W/mK for use in masonry full fill cavity wall applications.
Knauf Cavity Slabs are highly durable, odourless, rot proof, non-hygroscopic, does not s..
150mm Knauf DriTherm 37 is a standard non-combustible, water-repellent glass mineral wool insulation slab with a certified thermal conductivity of 0.037W/mK for use in masonry full fill cavity wall applications.
Knauf Cavity Slabs are highly durable, odourless, rot proof, non-hygroscopic, does no..